A tight and consistent 13-tooth gap between chainrings delivers accurate and dependable shifting and is the core of Sram`s X-Range gearingX-Range gearing technology gives you more range and a smoother gear progression, so you`re always in the right gearCrisp and accurate front shiftsDurable finish107mm 4-bolt35TBlack12spStandardUPC/EAN/GTIN: 710845866715